| 刘强,吴健.不同界面计算方法对液滴在电场作用下变形数值模拟精度的影响[J].计算力学学报,2023,40(6):979~984 |
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| 不同界面计算方法对液滴在电场作用下变形数值模拟精度的影响 |
| The effect of different interface capture methods on the simulation accuracy of droplet deformation under electric field |
| 投稿时间：2021-05-19 修订日期：2022-09-10 |
| DOI：10.7511/jslx20210519003 |
| 中文关键词: 电流体动力学 VOF模型 液滴变形 表面张力算法 OpenFOAM |
| 英文关键词:electrohydrodynamics VOF model droplet deformation surface tension algorithm OpenFOAM |
| 基金项目:国家自然科学基金(11802079);国家重点研发项目(2020YFC2201000). |
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| 摘要点击次数: 321 |
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| 中文摘要: |
| 液滴在电场作用下的变形是电流体动力学的基础课题之一,表面张力的计算精度对液滴变形量的模拟结果有重要影响。本文以开源计算流体动力学平台OpenFOAM的VOF模型为框架,研究了MULES和isoAdvector两类界面更新算法与相分数梯度和RDF函数两类曲率算法对电场作用下液滴变形模拟精度的影响。研究表明,isoAdvector算法相比MULES算法对网格密度的要求更低,但其耦合相分数梯度算法计算表面张力的误差较高。isoAdvector算法耦合RDF函数算法计算误差较低,并且在使用轴对称网格时,只有该算法能够同时处理液滴平行于电场和垂直于电场方向的变形,得到的数值结果与解析解吻合较好。 |
| 英文摘要: |
| Droplet’ s deformation under electric field is a basic research topic in Electrohydrodynamics.The accuracy of surface tension has a great influence on the simulation of droplet deformation.Based on the VOF model in OpenFOAM,we studied the effect of different phase update methods (MULES and isoAdvector algorithm) as well as different curvature calculation methods (phase fraction gradient and RDF function algorithm) on the simulation accuracy of droplet deformation under electric field.The results show that the isoAdvector algorithm requires lower mesh density than the MULES algorithm,but it generates higher error in surface tension calculation when coupled with phase fraction gradient algorithm.The simulation error of isoAdvector coupled RDF function algorithm is low,and it can deal with the droplet deformation both parallel and perpendicular to the electric field when using axisymmetric grids.The numerical results are in good agreement with the analytical solutions when using the isoAdvector coupled RDF function algorithm. |
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